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A variant container for hosting instances of util::TokenType.
Allows strong typing when a token can be one of many types.

BUG=1096617

Change-Id: Iec386f9760d4b093931ecdc6c477c202ae00bdc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327644
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794585}